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Police in New Braunfels, Texas are investigating a teenager who allegedly threatened to kill his little sister if rapper J. Cole didn't retweet his message.  The 19-year old - an apparent fan of Cole's - sent the rapper a picture of person pointing a gun at a young girl along with the threatening message.  

A rep for the New Braunfels Police Department tells the teen is cooperating with them, adding that the case seems to simply be "a bad lapse in judgment." 

Authorities also confirmed that the gun was not an actual handgun, but a BB gun.  So far, police have not filed charges, but the investigation is still open. 

Meantime, the teenager tells the celebrity gossip website that the picture was supposed to be a joke and that his sister was a willing participant.  He also apologized to J. Cole. 

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